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发明名称
Improvements relating to drawworks for well drilling plant
摘要
申请公布号
GB391957(A)
申请公布日期
1933.05.11
申请号
GB19320007799
申请日期
1932.03.16
申请人
THE NATIONAL SUPPLY CORPORATION
发明人
分类号
E21B3/06
主分类号
E21B3/06
代理机构
代理人
主权项
地址
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